{"id":"CVE-2026-98102","summary":"ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()\n\nWhen removing a source filter whose count reaches zero, ip6_mc_del1_src()\nunlinks psf from pmc-\u003emca_sources. If the filter was previously active,\nthe code moved psf directly into pmc-\u003emca_tomb by updating psf-\u003esf_next.\n\nBecause pmc-\u003emca_sources is traversed locklessly under RCU (e.g. by\nipv6_chk_mcast_addr()), mutating psf-\u003esf_next before a grace period\nelapses diverts concurrent readers to the tombstone list. Consequently,\nreaders miss remaining active sources in pmc-\u003emca_sources and improperly\nexamine deleted tombstone entries.\n\nFix this by allocating a new tombstone node for pmc-\u003emca_tomb (as done\nin sf_setstate()) and retiring the original psf via kfree_rcu().","modified":"2026-09-26T03:48:28.137481695Z","published":"2026-09-25T10:35:53.332Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98102.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98102.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98102"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4b200e398953c237c86d32bf26d4cb2a96556a6f"},{"fixed":"4352737297b262e8367675c19a7dc6a9f53c97af"},{"fixed":"8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4"},{"fixed":"5149c60c406595b56fda0c6e9aae7fd287f636aa"},{"fixed":"93b49239840b91313adbd77b8b52993eff2d08c1"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"86c49119f0353f857cc08030ec9e4ebaab3d5a64"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.261"},{"fixed":"5.11"}]}],"versions":["v5.10.260","v5.10.259","v5.10.258","v5.10.257","v5.10.256","v5.10.255","v5.10.254","v5.10.253","v5.10.252","v5.10.251","v5.10.250","v5.10.249","v5.10.248","v5.10.247","v5.10.246","v5.10.245","v5.10.244","v5.10.243","v5.10.242","v5.10.241","v5.10.240","v5.10.239","v5.10.238","v5.10.237","v5.10.236","v5.10.235","v5.10.234","v5.10.233","v5.10.232","v5.10.231","v5.10.230","v5.10.229","v5.10.228","v5.10.227","v5.10.226","v5.10.225","v5.10.224","v5.10.223","v5.10.222","v5.10.221","v5.10.220","v5.10.219","v5.10.218","v5.10.217","v5.10.216","v5.10.215","v5.10.214","v5.10.213","v5.10.212","v5.10.211","v5.10.210","v5.10.209","v5.10.208","v5.10.207","v5.10.206","v5.10.205","v5.10.204","v5.10.203","v5.10.202","v5.10.201","v5.10.200","v5.10.199","v5.10.198","v5.10.197","v5.10.196","v5.10.195","v5.10.194","v5.10.193","v5.10.192","v5.10.191","v5.10.190","v5.10.189","v5.10.188","v5.10.187","v5.10.186","v5.10.185","v5.10.184","v5.10.183","v5.10.182","v5.10.181","v5.10.180","v5.10.179","v5.10.178","v5.10.177","v5.10.176","v5.10.175","v5.10.174","v5.10.173","v5.10.172","v5.10.171","v5.10.170","v5.10.169","v5.10.168","v5.10.167","v5.10.166","v5.10.165","v5.10.164","v5.10.163","v5.10.162","v5.10.161","v5.10.160","v5.10.159","v5.10.158","v5.10.157","v5.10.156","v5.10.155","v5.10.154","v5.10.153","v5.10.152","v5.10.151","v5.10.150","v5.10.149","v5.10.148","v5.10.147","v5.10.146","v5.10.145","v5.10.144","v5.10.143","v5.10.142","v5.10.141","v5.10.140","v5.10.139","v5.10.138","v5.10.137","v5.10.136","v5.10.135","v5.10.134","v5.10.133","v5.10.132","v5.10.131","v5.10.130","v5.10.129","v5.10.128","v5.10.127","v5.10.126","v5.10.125","v5.10.124","v5.10.123","v5.10.122","v5.10.121","v5.10.120","v5.10.119","v5.10.118","v5.10.117","v5.10.116","v5.10.115","v5.10.114","v5.10.113","v5.10.112","v5.10.111","v5.10.110","v5.10.109","v5.10.108","v5.10.107","v5.10.106","v5.10.105","v5.10.104","v5.10.103","v5.10.102","v5.10.101","v5.10.100","v5.10.99","v5.10.98","v5.10.97","v5.10.96","v5.10.95","v5.10.94","v5.10.93","v5.10.92","v5.10.91","v5.10.90","v5.10.89","v5.10.88","v5.10.87","v5.10.86","v5.10.85","v5.10.84","v5.10.83","v5.10.82","v5.10.81","v5.10.80","v5.10.79","v5.10.78","v5.10.77","v5.10.76","v5.10.75","v5.10.74","v5.10.73","v5.10.72","v5.10.71","v5.10.70","v5.10.69","v5.10.68","v5.10.67","v5.10.66","v5.10.65","v5.10.64","v5.10.63","v5.10.62","v5.10.61","v5.10.60","v5.10.59","v5.10.58","v5.10.57","v5.10.56","v5.10.55","v5.10.54","v5.10.53","v5.10.52","v5.10.51","v5.10.50","v5.10.49","v5.10.48","v5.10.47","v5.10.46","v5.10.45","v5.10.44","v5.10.43","v5.10.42","v5.10.41","v5.10.40","v5.10.39","v5.10.38","v5.10.37","v5.10.36","v5.10.35","v5.10.34","v5.10.33","v5.10.32","v5.10.31","v5.10.30","v5.10.29","v5.10.28","v5.10.27","v5.10","v5.10.26","v5.10.25","v5.10.24","v5.10.23","v5.10.22","v5.10.21","v5.10.20","v5.10.19","v5.10.18","v5.10.17","v5.10.16","v5.10.15","v5.10.14","v5.10.13","v5.10.12","v5.10.11","v5.10.10","v5.10.9","v5.10-rc1","v5.10.8","v5.10.7","v5.10.6","v5.10.5","v5.10.4","v5.10.3","v5.10.2","v5.10.1","v5.10-rc7","v5.10-rc4","v5.10-rc3","v5.10-rc6","v5.9","v5.10-rc2","v5.10-rc5","v5.9-rc1","v5.9-rc7","v5.9-rc8","v5.9-rc6","v5.9-rc4","v5.9-rc5","v5.9-rc3","v5.9-rc2","v5.8","v5.7","v5.8-rc2","v5.8-rc1","v5.8-rc7","v5.8-rc5","v5.8-rc3","v5.8-rc4","v5.8-rc6","v5.7-rc4","v5.7-rc7","v5.7-rc1","v5.7-rc3","v5.7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